Robert Pattinson lashes out at cheating girlfriend Kristen Stewart and remains undecided whether to give her a second chance

‘You completely humiliated me’: Robert Pattinson lashes out to cheating girlfriend Kristen Stewart and remains ‘undecided’ whether to give her a second chance'Devastated and angry' about tryst with married British director Relationship hangs in the balance after her grovelling apologySource 'not sure' if three-year romance can recover Robert and Kristen last pictured together on SundayIt is unclear exactly when the actor was told about affair

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UPDATED:

08:15 GMT, 27 July 2012

Humiliation: Robert Pattinson, seen here with Kristen Stewart at last Sunday's Teen Choice Awards is said to be 'devastated' and 'completely hurt'

He is reported to have packed his bags and left the LA mansion he shared with girlfriend Kristen Stewart following the news she cheated on him with married director Rupert Sanders.

But despite Kristen’s very public apology regarding her ‘momentary indiscretion,’ Robert Pattinson is reported to be in two minds about giving his Twilight co-star a second chance.

A source close to the star told The UK Mirror: ‘Rob is devastated and deeply hurt. They spoke on the phone and he said “You’ve completely humiliated me.”

‘All the trust has gone.’

The source said that the 26-year-old British actor ‘couldn’t believe what he was hearing’ when Kristen told him the fling was just a ‘one off.’

It's unclear exactly when Robert found out about the 22-year-old's affair with the Snow White and the Huntsman director, who has two children with British model Liberty Ross.

Kristen and Rupert were photographed in the throes of passion on July 17 but the images did not surface in the media until two days ago.

And while Kristen and her married director paramour have both issued grovelling apologies for their exposed affair, Robert has remained resolutely silent.

The source told the Mirror that it was‘furious ‘ Robert who demanded Kristen apologise and she agreed.

'Robert wanted the world to know that he hadn’t done anything wrong and that she had made a fool of him publicly,' said the insider.

'He still can’t fathom why she cheated. Kristen is begging for another chance. Robert is undecided.'

The actress released a statement yesterday saying: 'I’m deeply sorry for the hurt and embarrassment I’ve caused.

'This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I’m so sorry.'

Fling: Kristen, pictured with Snow White and the Huntsman director Rupert Sanders in May, has apologised for her 'momentary indiscretion' with the married 41-year-old

Out: The actor is understood to have pack his bags and left the LA home they share

The couple were last seen in public at the Teen Choice Awards together on July 22 looking like a decidedly happy couple.

But fellow attendees back stage at the ceremony detected some tension between them away from cameras, with a source telling the New York Post: 'Rob and Kristen were having a long and intense conversation backstage, and he looked miserable, heartbroken and humiliated. She was pleading.'

The actor made his feelings regarding infidelity clear in April, telling Vanity Fair: 'There's a thing I've never got: That is, why do people cheat'

Keeping her secret: The pair enjoyed a night out in Hollywood on July 19… two days after her tryst with the director

He explained that while he 'can understand the impulse' to cheat, he doesn't comprehend 'how you can keep two relationships going at the same time for long.'

'I'm not the casual-affair kind of guy,' he said. 'If I choose to be with someone, it's because I really want it. When I have a relationship, I'm 100 percent into it.'

The star has not emerged since details of the dalliance hit the press.

Us Weekly detailed the liaison, with a source saying Rupert was 'all over' Kristen.

Another source added they 'would only take a break [from kissing] when they thought someone was walking by.'

A photographer followed Kristen from her Los Feliz home and when the actress pulled into the parking lot of a deserted building and Rupert got into her car.

The source explained: 'It seemed like they couldn't get enough. Kristen was sitting up with her back against the driver's-side window, and this guy was kissing her entire body.'

Life imitated art: The couple are in love onscreen too, as Edward and Bella in the Twilight Saga

Taking direction: Kristen and Rupert seen chatting in between takes on the set of Snow White And The Huntsman

The pair left when they thought they were being watched and drove to an area near the Hollywood sign and Kristen appeared 'swept up in the moment' as they kissed and cuddled outside the car.

While the area they were in was quite deserted, they were disturbed by some dog walkers and each time 'as soon as they heard a voice, they would split up and walk in opposite directions'.

Meanwhile, the young heartthrobs new movie The Rover has been given the green light by Screen Australia, according to The Hollywood Reporter.

Set in the Australian desert, The Rover is a futuristic western that 'tells the story of Eric (Guy Pearce), who has left everything, everyone and every semblance of human kindness behind him, as he’s forced to join an injured gang member, Rey (Pattinson), to hunt down Rey’s gang after they steal the last of Eric’s possessions.'

Before the drama: Liberty was seen posing up with Kristen, as well as Charlize Theron and Lily Cole, at the London premiere of the movie last month